WO2011158946A1 - Cutting insert for screw processing - Google Patents
Cutting insert for screw processing Download PDFInfo
- Publication number
- WO2011158946A1 WO2011158946A1 PCT/JP2011/063982 JP2011063982W WO2011158946A1 WO 2011158946 A1 WO2011158946 A1 WO 2011158946A1 JP 2011063982 W JP2011063982 W JP 2011063982W WO 2011158946 A1 WO2011158946 A1 WO 2011158946A1
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- WO
- WIPO (PCT)
- Prior art keywords
- flank
- blade
- cutting insert
- face
- cutting
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G5/00—Thread-cutting tools; Die-heads
- B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
- B23G5/04—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/06—Profile cutting tools, i.e. forming-tools
- B23B27/065—Thread-turning tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
- B23B27/145—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having a special shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G5/00—Thread-cutting tools; Die-heads
- B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/20—Top or side views of the cutting edge
- B23B2200/205—Top or side views of the cutting edge with cutting edge having a wave form
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
- Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/904—Tool or Tool with support with pitch-stabilizing ridge
- Y10T408/9046—Tool or Tool with support with pitch-stabilizing ridge including tapered section
- Y10T408/90467—Tool or Tool with support with pitch-stabilizing ridge including tapered section and relieved cutting edge
Definitions
- the present invention relates to a cutting insert used for thread cutting.
- the thread cutting edge of a cutting insert for pipe threading called a chaser has a plurality of mountain-shaped convex cutting edges arranged substantially in parallel at predetermined intervals.
- the predetermined interval is generally equal to the pitch of the screw to be processed.
- a cutting insert for threading does not degrade the shape accuracy of a thread to be machined, it is common to form the ridgeline and flank face of a cutting edge by grinding using a grinding wheel. Since the thread cutting edge of such a cutting insert for threading is long in the direction along the cutting edge, and the contour shape of the cutting edge as viewed from the rake face side is complex, the time required for grinding There is a problem that is long.
- a cutting insert disclosed in Patent Document 1 has been proposed.
- this cutting insert when the cutting insert for threading is threaded, at least one of the front side in the relative feed direction is a rough blade, and at least one of the rear side in the relative feed direction is a finishing blade.
- the height of the rough blade is lower than the height of the finished blade.
- this rough blade and the crest shape of the finishing blade are overlapped, the rough blade is formed small so that it fits in the finishing blade, and the roughness of the rough blade flank is reduced by the surface roughness of the finishing blade.
- the surface is rougher than the surface roughness of the flank.
- the present invention has been made to solve this problem, and provides a cutting insert for screw machining that can further reduce the manufacturing cost without deteriorating the accuracy of the shape of the machining screw.
- the cutting insert for threading of the present invention solves the problem by the following means.
- a rake face 2 is formed on the upper surface, and a flank face is formed between the rake face 2 and the lower face facing the upper face.
- a plurality of ridges are formed on the intersecting ridge line portion of the rake face 2 and the flank face.
- a cutting insert for threading in which a cutting edge is formed, and the cutting edge is smaller than the finishing blade 6a when viewed from the rake face 2 side with at least one finishing blade 6a for transferring the shape of the screw.
- at least one rough blade 6b formed in a mountain shape.
- the flank 4a of the finishing blade 6a has a first flank 5a and a second flank 5b having a larger flank angle than the first flank 5a in the normal direction of the cutting edge.
- the first flank 5a and the second flank 5b are arranged in this order from the finishing blade 6a toward the lower surface.
- the second flank 5b has the finishing blade 6a and the rake face 2 as viewed in the normal direction of the intersecting ridge line portion between the finishing blade 6a and the rake face 2 (thickness direction of the cutting insert for threading).
- the first flank 5a is continuously provided apart from the intersecting ridge line portion. Therefore, even if the surface roughness of the second flank 5b is rough or the shape accuracy is low, the shape accuracy of the finishing blade 6a is not adversely affected.
- the time for grinding the first flank 5a can be shortened, and the manufacturing cost of the cutting insert for threading can be reduced.
- the load on the grinding wheel can be reduced, and the life of the grinding wheel for grinding the first flank 5a can be extended. Furthermore, since there is little abrasion of a grinding wheel, the shape precision of the cutting edge ridgeline of the finishing blade 6a can be improved.
- FIG. 1 is a perspective view of a cutting insert for thread machining according to an embodiment of the present invention.
- FIG. 2 is a perspective view showing a first flank of the cutting insert shown in FIG.
- FIG. 3 is a plan view of the cutting insert shown in FIG. 1 as viewed from the upper surface side.
- FIG. 4 is a left side view of the cutting insert shown in FIG. 1 viewed from the left side.
- FIG. 5 is an enlarged sectional view taken along line VV in FIG.
- FIG. 6 is a plan view schematically showing the main part of the cutting insert shown in FIG.
- FIG. 1 is a perspective view of a threading cutting insert according to an embodiment of the present invention.
- FIG. 2 is a perspective view showing a first flank of the cutting insert for threading shown in FIG.
- FIG. 3 is a plan view of the threading cutting insert shown in FIG. 1 as viewed from the upper surface side.
- FIG. 4 is a left side view of the thread cutting cutting insert shown in FIG. 1 as viewed from the left side. The right side view is omitted.
- FIG. 5 is an enlarged sectional view taken along line VV in FIG.
- FIG. 6 is a schematic plan view of the main part of the cutting insert for threading shown in FIG.
- the cutting insert 1 for threading of this embodiment has a substantially rectangular plate shape as shown in FIGS.
- the tool material of the cutting insert 1 is selected from hard materials such as cemented carbide, cermet and ceramic, or those obtained by coating the surface of these hard materials with a PVD or CVD coating film.
- the upper surface of the cutting insert 1 is a rake face 2.
- the rake surface 2 is a flat surface.
- the rake face is not the upper face itself, but an inclined surface formed at a location closest to the cutting edge is the rake face.
- the lower surface of the cutting insert 1 serves as a seating surface 3, and the seating surface 3 serves as a contact surface when the cutting insert 1 is detachably attached to a cutting edge exchange type bite holder or the like.
- the portion of the lower surface that actually contacts the tool holder is the seating surface.
- a flank surface is formed on at least one side surface.
- the finishing blade 6a has a chevron disposed on the most rear side in the feeding direction F, and a bottom portion disposed on the rear side in the feeding direction F from the chevron adjacent thereto and a bottom portion between adjacent chevron cutting blades. Consists of a series of cutting edges.
- the finishing blade 6a is a cutting blade that is pushed into a workpiece when the screw is finished with respect to the workpiece and transfers the shape of the screw.
- the range of the cutting edge of the finishing blade 6a needs to include the entire range in which the shape of the screw is transferred.
- the finishing blade 6a is formed in one chevron.
- the cutting insert 1 is formed with a rough blade 6b that is pushed into the workpiece and is involved in the roughing.
- the rough blade 6b is formed in four chevron shapes.
- flank 4a extending from the finishing blade 6a and the flank 4b extending from the rough blade 6b are flank surfaces having so-called positive clearance angles that gradually incline toward the seating surface 3.
- the sides in three directions other than the side where the plurality of mountain-shaped cutting edges are formed are not cutting edges involved in cutting. .
- the side surface of the side that is not the cutting edge involved in the cutting in the three directions is a flank surface with a clearance angle of 0 ° as seen in the cross section in the normal direction of each side.
- the side surfaces of the two sides serve as side surfaces for positioning reference when the cutting insert 1 is detachably mounted on a cutting edge replaceable bite holder or the like. Which one of the three side surfaces is used as a positioning reference side is determined by the blade-type replaceable tool holder used.
- a side surface including a side opposite to the plurality of mountain-shaped cutting blades and a side surface including a side closer to the finishing blade 6a are used as positioning reference side surfaces.
- one finishing blade 6a and four rough blades 6b constitute a set of cutting blades.
- Each rough edge 6b is a chevron-shaped cutting edge smaller than the finishing edge 6a when viewed from the rake face 2 side so as to leave a margin for the finishing edge 6a. Since the cutting insert 1 of this embodiment is provided with a plurality of rough blades 6b, the mountain shape of the rough blade 6b is gradually reduced toward the front side in the feed direction F. By doing so, the machining allowance of each rough blade 6b is appropriately distributed. Moreover, the cutting load which each of the four rough blades 6b bears by this is distributed.
- the size of the mountain shape of the rough blade 6b may be adjusted at the height of the mountain shape, or by other methods (for example, more complicated shapes). You may go.
- a threading cutting insert provided with a plurality of finishing blades 6a is also possible. When cutting a screw into a workpiece, each of the pair of finishing blades 6a and roughing blades 6b shares the order to process the screws. Therefore, if the number of finishing blades 6a is increased, the processing of the processed screw The change with time in accuracy is suppressed.
- the rake face 2 is a substantially flat surface, but a chip breaker groove may be formed along the cutting edge (finishing edge 6a and rough edge 6b) (not shown).
- the chip breaker is not limited to the groove type, but may be a protrusion type or a rising wall surface type called a step shape (not shown).
- the flank 4a of the finishing blade 6a has a substantially flat surface generally formed by grinding using a grinding wheel.
- the flank 4a of the finishing blade 6a has a first flank 5a and a flank angle ⁇ b larger than the flank angle ⁇ a of the first flank 5a as viewed in the direction of the enlarged cross-sectional view of FIG. 2 flank 5b.
- the symbol W indicates the formation range of the first flank 5a.
- the clearance angle ⁇ a of the first flank 5a at the top of the peak is preferably in the range of 2 ° or more and 15 ° or less when viewed in the normal direction cross section of the top of the ridge shape of the finishing blade 6a.
- the clearance angle ⁇ a of the first flank 5a is smaller than 2 °, the clearance angle is insufficient, and the flank wear progresses rapidly, causing a problem in tool life.
- the clearance angle ⁇ a of the first flank 5a is larger than 15 °, the edge angle near the cutting edge is insufficient, so that the cutting edge strength is insufficient, and abnormal damage such as chipping and chipping is likely to occur.
- the cutting insert 1 of the present invention includes a flank extending from the top of the angled cutting edge in contact with the bottom of the thread groove to be machined, a flank extending from an inclined part of the angled cutting edge in contact with the flank of the screw, and the peak of the thread groove crest.
- the flank may be changed on each flank instead of the same flank. This is because the clearance angle does not necessarily need to be the same for each flank described above in consideration of interference with the surface of the workpiece.
- the flank face provided with the corresponding thread groove portion on the same cutting edge part has the same flank angle on both the first flank face 5a and the second flank face 5b. It is desirable to set.
- the threading cutting insert when a clearance angle is formed in the threading cutting insert, the threading cutting insert is inclined in the normal direction of the top of the thread to grind the clearance surface. In this case, the clearance angle formed is maximized in the normal direction of the crest of the screw thread, and the clearance angle seen in the normal direction of the cutting edge different from this direction is small.
- the first flank 5a is formed continuously with the entire area of the finishing blade 6a.
- the first flank 5a is formed partway along the flank 4a when viewed in the thickness direction of the cutting insert 1 of the present embodiment.
- a part of the first flank 5a is formed so as to extend to the lower seating surface 3, but a part of the first flank 5a need not necessarily extend to the seating surface 3.
- all of the first flank 5a may be formed partway along the flank 4a.
- the second flank 5b having a larger flank angle than the first flank 5a extends to the seating surface 3 on the lower surface.
- the second flank 5b of this embodiment is formed to be substantially flat, but is not limited to this, and may be a curved surface or a complex surface obtained by combining a plurality of surfaces.
- the angle formed by the tangential plane and the rake face 2 at an arbitrary position of the second flank 5b is greater than the angle formed by the rake face 4b and the rake face 2 of the rough blade. Is preferably small.
- the threading cutting insert of the present invention is formed into a desired final shape by grinding using a grinding wheel on a material made of a hard sintered body such as cemented carbide, cermet, or ceramic.
- the material is formed into a shape that allows for a grinding allowance in a desired final shape by powder pressure molding and sintering.
- grinding is performed on the upper surface of the material to form a rake face consisting of a flat surface.
- a chip breaker groove or the like may be formed in advance on the upper surface of the material.
- the upper surface of the material becomes the rake face 2, and grinding of the rake face 2 is not necessarily required.
- the second flank 5b can be molded by grinding, but can also be molded by powder pressure molding and sintering. In the case of molding by powder pressure molding and sintering, the cutting insert for threading according to the present invention can further greatly reduce the manufacturing cost. However, for the sake of simplicity, only the embodiment in which the second flank 5b is ground will be described below, and the description of the embodiment in which the second flank 5b is formed by powder pressure molding and sintering will be omitted. To do.
- the flank surfaces 4a and 4b are processed by being divided into two processes of rough grinding and finish grinding.
- the second flank 5b is formed on the flank of the rough blade 6b and the finishing blade 6a.
- the second flank 5b may have a rougher surface than the first flank 5a.
- Ra is preferably in the range of more than 0.20 ⁇ m and 0.80 ⁇ m or less. Therefore, in rough grinding, it is possible to use a grinding wheel for roughing that prioritizes the grinding efficiency over the shape accuracy of the cutting edge and the surface roughness of the flank.
- flank 4b of the rough blade is constituted only by the second flank 5b by rough grinding. That is, the cutting edge ridgeline of the rough edge 6b can be formed in many parts as an intersecting ridgeline portion between the second flank 5b and the rake face 2.
- Ra is 0.20 ⁇ m or less
- it is the same as the conventional insert, and there is no problem in use.
- the necessity for Ra to be 0.20 ⁇ m or less is eliminated, and the grinding efficiency of rough grinding is improved.
- Ra exceeds 0.80 ⁇ m the cutting edge accuracy of the rough blade 6b deteriorates and abnormal damage such as chipping is likely to occur.
- the flank 4a of the finishing blade is formed through rough grinding and finish grinding. That is, part or all of the second flank 5b by rough grinding is scraped off by subsequent finish grinding.
- the second flank 5b formed on the flank 4a of the finishing blade is formed while leaving a grinding allowance for the final shape of the flank 4a of the finishing blade.
- rough grinding it is desirable to give priority to grinding efficiency and use, for example, a total shape grindstone capable of grinding a plurality of angled cutting edges simultaneously. Of course, a plurality of angled cutting edges may be individually ground.
- the first flank 5a is formed on the flank 4a of the finish blade including the entire area of the finish blade 6a and the flank 4b of the rough blade.
- a grinding wheel for finishing is used, which has better shape accuracy and surface roughness after processing than a grinding wheel used in rough grinding.
- Ra needs to be 0.20 ⁇ m or less, and Ra is preferably 0.10 ⁇ m or more in consideration of manufacturing cost.
- the first flank 5a intersects the rake face 2, and a cutting edge ridge line including the entire area of the finishing blade 6a is formed at the intersecting ridge line portion.
- the first flank 5a continues to the entire area of the finishing blade 6a, but is not formed over the entire area of the flank 4a. Therefore, a part of the second flank 5b formed by rough grinding remains apart from the finishing blade 6a. Thereby, the grinding allowance of the 1st flank 5a is adjusted appropriately, it becomes possible to shorten the time which grinds, and the manufacturing cost of the cutting insert for screw processing reduces.
- the formation range W of the first flank 5a in FIG. 5 is preferably formed in the range of 0.5 mm or more and 5 mm or less from the finishing blade 6a in the thickness direction of the cutting insert.
- the forming range W is in the range of 0.5 mm to 5 mm, the load on the grinding wheel for grinding the first flank 5a is reduced and the time required for grinding the first flank 5a is shortened. The Thereby, the manufacturing cost of the cutting insert can be reduced.
- the life of the grinding wheel for grinding the first flank 5a is extended. Furthermore, since the wear of the grinding wheel is reduced, the shape accuracy of the finishing blade 6a can be increased.
- the formation range W of the first flank 5a exceeds 5 mm from the finishing blade 6a, the effect of reducing the grinding allowance is lost, and the manufacturing cost is not reduced.
- the length of the whole side surface used as a flank is 5 mm or less from a cutting edge ridgeline, you may form so that a part of 1st flank 5a may reach the seating surface 3 like FIG. Absent.
- the formation range W is less than 0.5 mm from the edge of the cutting edge, when the flank wear on the finishing blade 6a exceeds the length of the first flank 5a, the machining screw thread due to flank wear is reduced. Deterioration of shape accuracy proceeds rapidly. Therefore, when the tool life is determined by the shape accuracy of the processed screw, there is a problem that the tool life is shortened.
- the clearance angle of the second flank 5b is slightly larger than the clearance angle of the first flank 5a, preferably in the range of 1 ° or more and 10 ° or less. If the difference in the clearance angle is smaller than 1 °, it is difficult to reliably leave the second clearance surface 5b, and manufacturing variation in the position of the boundary line between the first clearance surface 5a and the second clearance surface 5b increases. If the difference in clearance angle exceeds 10 °, a lot of grinding allowance for the first clearance surface 5a remains, and the effect of reducing the manufacturing cost is lost. When the clearance angle of the first flank 5a is close to the aforementioned upper limit of 15 °, it is preferable that the difference between the clearance angles be in the range of 1 ° to 3 °. As described above, many portions of the rough blade 6b are formed with cutting edges by the second flank 5b. If the flank angle of the second flank exceeds 15 °, abnormal damage such as chipping or chipping occurs. easy.
- the first flank 5a and the second flank 5b are ridges that protrude outward when viewed in the cross section in the normal direction of the crest of the crest of the finishing blade 6a. Intersect.
- the straight line obtained by extending the surface of the first flank 5a is inclined outward without interfering with the surface of the second flank 5b. Therefore, the first flank 5a can be ground using the grinding wheel without interfering with the second flank 5b.
- the time required for grinding the first flank 5a can be shortened, and the manufacturing cost of the cutting insert can be reduced.
- the flank 4b of the rough blade 6b has at least one of the first flank 5a and the second flank 5b.
- the second flank 5b may have a rougher surface than the first flank 5a. Therefore, even when the second flank 5b is formed by grinding, the second flank 5b can be made highly efficient, for example, by increasing the feed under grinding conditions. Moreover, a rough grinding wheel with coarse abrasive grains can be used.
- the second flank 5b can be formed by grinding, but can also be formed by powder pressing and sintering.
- the finishing blade 6a is a cutting blade that is pushed into the finished screw and works to transfer the shape of the threading cutting insert when the finished screw is machined on the workpiece. is there.
- the end 8 extending to the rough blade side of the first flank 5a is not formed in the finishing blade 6a, but is a boundary portion between the finishing blade 6a and the rough blade 6b. 7 is formed in the rough blade 6b.
- the tangent L1 of the intersecting ridge line portion between the first flank 5a and the rake face 2 at the end 8 extending to the rough edge side of the first flank 5a is at the end 8.
- the second flank 5b and the rake face 2 are inclined toward the outer side of the threading cutting insert with respect to the intersecting ridge line portion.
- This inclination angle is in the range of 1 ° or more and 3 ° or less when expressed by an angle ⁇ between the tangent line L2 of the intersecting ridge line part of the second flank 5b and the rake face 2 at the end 8 and the tangent line L1. It is preferable that When the inclination angle ⁇ is smaller than 1 °, it is difficult to reliably leave the second flank 5b, and manufacturing variation in the position of the boundary line between the first flank 5a and the second flank 5b increases.
- the inclination angle ⁇ is larger than 3 °, the probability of causing abnormal damage such as chipping and chipping at the time of cutting of the screw at the bent portion formed at the end portion 8 increases. If the inclination angle ⁇ is in the range of 1 ° or more and 3 ° or less, the bent portion generated at the end portion 8 does not become sharp. As a result, local tool damage is prevented from occurring at the end 8, so that the tool life of the cutting insert for threading can be prevented from being reduced.
- the screw machined by the cutting insert for screw machining is machined by the finishing blade 6a having a high shape accuracy formed by the intersecting ridge line of the first flank 5a and the rake face 2, and maintains a high shape accuracy. it can. Further, the finishing blade 6a is compensated for the shape accuracy up to the boundary portion 7 with the rough blade 6b, and a cutting insert having the finishing blade 6a with high shape accuracy by grinding can be provided.
- the amount of the first flank 5a extending to the rough blade 6b side beyond the boundary portion 7 between the finish blade 6a and the rough blade 6b is not particularly limited, but is made as small as possible so as not to increase the time required for finish grinding. It is desirable. In finish grinding, a general grinding wheel for transferring the shape to the finishing blade is generally used, but other methods such as profile grinding may be employed.
- the cutting insert for screw machining described above is a machine tool such as a lathe that feeds a workpiece rotating around the rotation center line in a direction parallel to the rotation center line or inclined at a predetermined angle. Given this, at least one pair of rough blade 6b and finishing blade 6a are sequentially pushed into the outer peripheral surface or inner peripheral surface of the workpiece, thereby performing thread cutting.
- One roughing blade disposed on the rear side in the feed direction F of the rough blade 6b after the four rough blades 6b disposed on the front side in the feed direction F have roughened the screw prior to the finish blade 6a. 6a finishes the processed screw into a predetermined screw shape.
- the present invention is not limited to the embodiment described above, and it goes without saying that the configuration can be changed, added and deleted as appropriate without departing from the gist of the invention.
- the illustrated cutting insert has a set of rough edges and finishing edges, but can be changed to one having a plurality of sets of rough edges and finishing edges, so-called multi-corner type.
- the shape of the thread cutting edge of the cutting insert can also be changed as appropriate according to the desired shape.
- the finishing blade was comprised by one chevron, a finishing blade may be formed in several chevron.
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- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
2 すくい面(上面)
3 着座面(下面)
4a 仕上げ刃の逃げ面
4b 荒刃の逃げ面
5a 第1逃げ面
5b 第2逃げ面
6a 仕上げ刃
6b 荒刃
7 仕上げ刃と荒刃との境界部
8 第1逃げ面とすくい面との交差稜線部の端部
F 切削インサートの相対的な送り方向
θa 第1逃げ面の逃げ角
θb 第2逃げ面の逃げ角
W 第1逃げ面の形成範囲
L1 すくい面側からみた、第1逃げ面とすくい面との交差稜線部の端部における、第1逃げ面とすくい面との交差稜線部の接線
L2 すくい面側からみた、第1逃げ面とすくい面との交差稜線部の端部における、第2逃げ面とすくい面との交差稜線部の接線
α 接線L2に対する、接線L1の傾斜角度 1 Cutting insert for threading 2 Rake face (upper surface)
3 Seating surface (bottom surface)
4a
Claims (4)
- 上面にすくい面が形成され、前記上面に対向する下面との間に側面となる逃げ面が形成され、前記すくい面側からみて、前記すくい面と前記逃げ面との交差稜線部に複数の山形状の切れ刃が形成されるねじ加工用の切削インサートであって、
前記切れ刃は、ねじの形状を転写するための少なくとも1つの仕上げ刃と、前記すくい面側からみて、前記仕上げ刃よりも小さな山形状に形成される少なくとも1つの荒刃とを備え、前記仕上げ刃の逃げ面は、第1逃げ面と、前記切れ刃の法線方向でみて、前記第1逃げ面より逃げ角が大きい第2逃げ面とを有し、前記すくい面から前記下面に向かって、前記仕上げ刃から前記第1逃げ面、前記第2逃げ面の順に連設されることを特徴とするねじ加工用の切削インサート。 A rake face is formed on the upper surface, and a flank face is formed between the lower face opposite to the upper face, and a plurality of peaks are formed at the crossing ridge line portion of the rake face and the flank face when viewed from the rake face side. A cutting insert for threading in which a cutting edge having a shape is formed,
The cutting edge includes at least one finishing blade for transferring the shape of a screw, and at least one rough blade formed in a mountain shape smaller than the finishing blade as viewed from the rake face side, The flank face of the blade has a first flank face and a second flank face having a larger flank angle than the first flank face when viewed in the normal direction of the cutting edge, from the rake face toward the lower face. A cutting insert for threading, characterized in that the first flank and the second flank are arranged in this order from the finishing blade. - 前記仕上げ刃の前記山形状の山頂部の法線方向の断面でみて、前記山頂部の前記第1逃げ面の逃げ角は、2°以上15°以下の範囲とされ、かつ前記第2逃げ面の逃げ角が前記第1逃げ面の逃げ角よりも、1°以上10°以下の範囲で大きいことを特徴とする請求項1に記載のねじ加工用の切削インサート。 The clearance angle of the first flank of the peak is in the range of 2 ° to 15 ° when viewed in a normal direction cross section of the peak of the peak of the finishing blade, and the second flank The cutting insert for threading according to claim 1, wherein the clearance angle is larger in the range of 1 ° to 10 ° than the clearance angle of the first flank.
- 前記すくい面側からみて、前記第1逃げ面と前記すくい面との交差稜線部は、前記仕上げ刃の全域に形成され、前記仕上げ刃と前記荒刃との境界部を越えて前記荒刃側へ延びており、前記荒刃側へ延びた端部における前記交差稜線部の接線が、前記端部における前記第2逃げ面と前記すくい面との交差稜線部に対して、前記切削インサートの外側に傾斜していることを特徴とする請求項1または2に記載のねじ加工用の切削インサート。 When viewed from the rake face side, the intersecting ridge line portion between the first flank face and the rake face is formed in the entire area of the finishing blade, and passes the boundary between the finishing blade and the rough blade, and the rough blade side. The tangent line of the intersecting ridge line portion at the end portion extending to the rough blade side is outside the cutting insert with respect to the intersecting ridge line portion between the second flank surface and the rake surface at the end portion. The cutting insert for threading according to claim 1 or 2, wherein the cutting insert is threaded.
- 前記すくい面側からみて、前記荒刃側へ延びた端部における前記接線が、前記切削インサートの外側に傾斜している角度は、1°以上3°以下の範囲であることを特徴とする請求項3に記載のねじ加工用の切削インサート。 The angle at which the tangent at the end extending toward the rough blade as viewed from the rake face side is inclined to the outside of the cutting insert is in the range of 1 ° to 3 °. Item 4. A cutting insert for threading according to Item 3.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020127031827A KR20130008084A (en) | 2010-06-17 | 2011-06-17 | Cutting insert for screw processing |
RU2013102040/02A RU2013102040A (en) | 2010-06-17 | 2011-06-17 | CUTTING PLATE FOR CUTTING THREADS |
BR112012031892A BR112012031892B8 (en) | 2010-06-17 | 2011-06-17 | cutting insert for thread forming work |
CA2802833A CA2802833C (en) | 2010-06-17 | 2011-06-17 | Cutting insert for threading |
CN201180029843.9A CN102933342B (en) | 2010-06-17 | 2011-06-17 | Cutting insert for threading |
JP2012520514A JP5561363B2 (en) | 2010-06-17 | 2011-06-17 | Cutting insert for threading |
EP11795848.8A EP2583780A1 (en) | 2010-06-17 | 2011-06-17 | Cutting insert for screw processing |
US13/717,053 US8740516B2 (en) | 2010-06-17 | 2012-12-17 | Cutting insert for threading |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-138211 | 2010-06-17 | ||
JP2010138211 | 2010-06-17 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/717,053 Continuation US8740516B2 (en) | 2010-06-17 | 2012-12-17 | Cutting insert for threading |
US13/717,053 Continuation-In-Part US8740516B2 (en) | 2010-06-17 | 2012-12-17 | Cutting insert for threading |
Publications (1)
Publication Number | Publication Date |
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WO2011158946A1 true WO2011158946A1 (en) | 2011-12-22 |
Family
ID=45348337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/063982 WO2011158946A1 (en) | 2010-06-17 | 2011-06-17 | Cutting insert for screw processing |
Country Status (9)
Country | Link |
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US (1) | US8740516B2 (en) |
EP (1) | EP2583780A1 (en) |
JP (1) | JP5561363B2 (en) |
KR (1) | KR20130008084A (en) |
CN (1) | CN102933342B (en) |
BR (1) | BR112012031892B8 (en) |
CA (1) | CA2802833C (en) |
RU (1) | RU2013102040A (en) |
WO (1) | WO2011158946A1 (en) |
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US9511467B2 (en) | 2013-06-10 | 2016-12-06 | Ford Global Technologies, Llc | Cylindrical surface profile cutting tool and process |
JP6054544B2 (en) * | 2012-12-19 | 2016-12-27 | ザ・ティムケン・カンパニーThe Timken Company | Dual insert cutter and high-hardness turning method |
CN103128381A (en) * | 2013-03-21 | 2013-06-05 | 昆山华辰精密工具有限公司 | Slant ladder thread machining blade of petroleum pipeline |
JPWO2014189018A1 (en) * | 2013-05-20 | 2017-02-23 | 株式会社タンガロイ | Cutting inserts, tool bodies and cutting tools |
US10220453B2 (en) | 2015-10-30 | 2019-03-05 | Ford Motor Company | Milling tool with insert compensation |
EP3498405B1 (en) * | 2017-12-14 | 2022-08-17 | Sandvik Intellectual Property AB | Threading insert having variable edge roundness |
KR102043790B1 (en) * | 2017-12-26 | 2019-11-12 | 주식회사 포스코 | Insert for processing screw |
US10974327B1 (en) * | 2019-10-31 | 2021-04-13 | Facet Precision Tool GmbH | Drills and drill bits with buttressed chip breakers |
CN111545779A (en) * | 2020-05-19 | 2020-08-18 | 成都工具研究所有限公司 | Complex-forming multi-tooth cutter and machining method and using method thereof |
CN113333875B (en) * | 2021-06-28 | 2022-09-20 | 湘潭大学 | Thread chasing tool |
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- 2011-06-17 RU RU2013102040/02A patent/RU2013102040A/en not_active Application Discontinuation
- 2011-06-17 CA CA2802833A patent/CA2802833C/en active Active
- 2011-06-17 WO PCT/JP2011/063982 patent/WO2011158946A1/en active Application Filing
- 2011-06-17 JP JP2012520514A patent/JP5561363B2/en active Active
- 2011-06-17 CN CN201180029843.9A patent/CN102933342B/en active Active
- 2011-06-17 EP EP11795848.8A patent/EP2583780A1/en not_active Withdrawn
- 2011-06-17 BR BR112012031892A patent/BR112012031892B8/en active IP Right Grant
- 2011-06-17 KR KR1020127031827A patent/KR20130008084A/en not_active Application Discontinuation
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JP2007313590A (en) | 2006-05-24 | 2007-12-06 | Tungaloy Corp | Thread cutting tip, and its manufacturing method |
Also Published As
Publication number | Publication date |
---|---|
EP2583780A1 (en) | 2013-04-24 |
KR20130008084A (en) | 2013-01-21 |
CN102933342A (en) | 2013-02-13 |
US20130108384A1 (en) | 2013-05-02 |
JPWO2011158946A1 (en) | 2013-08-19 |
CN102933342B (en) | 2015-02-18 |
BR112012031892B8 (en) | 2021-03-30 |
BR112012031892B1 (en) | 2021-01-19 |
CA2802833C (en) | 2015-07-14 |
US8740516B2 (en) | 2014-06-03 |
RU2013102040A (en) | 2014-07-27 |
CA2802833A1 (en) | 2011-12-22 |
BR112012031892A2 (en) | 2020-07-21 |
JP5561363B2 (en) | 2014-07-30 |
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